My tests with "Vostok" shows what current FlightGear atmosphere have
serious issues in means of high altitude flights.
On reentry dynamic pressure inverts and have negative values on
60...50km. That can be tested by dropping any FG JSBSim based craft from
altitudes higher than 60km, from, say, 200.000ft.
Setting /environment/params/control-fdm-atmosphere to false in runtime
as Anders had propose does nothing.
Setting /environment/params/control-fdm-atmosphere to false in set file
by other Anders proposition
<environment>
<params>
<control-fdm-atmosphere
type="bool">0</control-fdm-atmosphere>
</params>
</environment>
makes atmosphere pressure to be equal to sea level pressure on any
altitude.
It seems to be inner FlightGear issue since standalone JSBSim tests do
not shows negative qbar in same trajectory conditions. It have other
problems, air pressure what seems to not depends of altitude if altitude
is high enough and equals 0.008310 on any high altitude, but not
antimatter in the middle.
Links of source files of standalone JSBSim test included.
vostok-reentry-test.xml http://pastebin.com/jxNuV952
vostok-reentry-test-runscript.xml http://pastebin.com/fKNupar3
vostok-reentry-test-reset.xml http://pastebin.com/bc60amQz
how-to-start.txt http://pastebin.com/4Yt2CaGV
With best regards,
Victor Slavvutinsky
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